Unstable states in QED of strong magnetic fields

Details Unstable states in QED of strong magnetic fields Unstable states in QED of strong magnetic fields

1996-01-09

arxiv.org/abs/hep-ph/9601229v1

Phys.Rev. D53 (1996) 974-979

Physics

High Energy Physics

High Energy Physics - Phenomenology

Revtex, 7 pages. To appear in Phys. Rev. D53(2)

Scientific paper

10.1103/PhysRevD.53.974

We question the use of stable asymptotic scattering states in QED of strong magnetic fields. To correctly describe excited Landau states and photons above the pair creation threshold the asymptotic fields are chosen as generalized Licht fields. In this way the off-shell behavior of unstable particles is automatically taken into account, and the resonant divergences that occur in scattering cross sections in the presence of a strong external magnetic field are avoided. While in a limiting case the conventional electron propagator with Breit-Wigner form is obtained, in this formalism it is also possible to calculate $S$-matrix elements with external unstable particles.

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